Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f8ce658e71be91…

MALICIOUS

PDF

73.0 KB Created: 2021-05-10 08:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8aa081d4808f8fc3b843a2431b06c6a0 SHA-1: 11c8f224db910f711b41dc0e64e1b1b835f2bb80 SHA-256: 05f8ce658e71be9176e7c43db34248c8018520b69cc23dd538fc27ca41b6a23b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=colbert+report+last+episode+song PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607833503ebfe---nenafadamizeganebaratoso.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ziwugakilitaxuvejixamebuj.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b94d1b0b2d---zatogisujajep.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b77e164f8---rujagobuzozukew.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8e0540451a30cf27731e48173a6206b1/24436440970.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281838444033.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/sjmqe914d94kkedsgrvnqv3d8l/48929252316.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/4991653779.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096e143553a6---xafibuxopib.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5911db3b0---35182942287.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hv4defrfs1cb9b383g4c1ta77/22719853439.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0d0a3944---17730605095.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ojctthgc57r9eh1mad2ol12voa/nebowumozarunex.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c750597238---surere.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4c201760b7c7ca8f3ee2389c47e89bd8/57335411018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 5172 bytes
SHA-256: 865017361f3a8db688e73e3b6a7af4281e32864b1aae09b905d1fd8efdee96a9
font_01_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 11500 bytes
SHA-256: 2f9669ff30d3e14026a9b4f4462e35d3a28e109be70ce9eb382c22f1cb49b27f